The sum of squares of the number of common points in all pairs of lattice paths from (0,0) to (x,y), for x >= 0, y >= 0 (the unnormalized second moment). The table is read by antidiagonals.
A324010
The sum of squares of the number of common points in all pairs of lattice paths from (0,0) to (x,y), for x >= 0, y >= 0 (the unnormalized second moment). The table is read by antidiagonals.
Terms
- a(0) =1a(1) =4a(2) =4a(3) =9a(4) =26a(5) =9a(6) =16a(7) =92a(8) =92a(9) =16a(10) =25a(11) =240a(12) =474a(13) =240a(14) =25a(15) =36a(16) =520a(17) =1704a(18) =1704a(19) =520a(20) =36a(21) =49a(22) =994a(23) =4879a(24) =8084a(25) =4879a(26) =994a(27) =49a(28) =64a(29) =1736
External references
- oeis: A324010